C# 流介紹 （原發佈 csdn 2017-09-15 23:37:52）

1、FileStream

FileStream 詳細介紹參考msdn

寫數據：

using (FileStream fs = new FileStream("File.FileStream", FileMode.Create, FileAccess.Write))
{
    for (int i = 0; i < Cycles; i++)
    {
        for (int j = 0; j < Length; j++)
        {
            dis[j] = i * Length + j;
        }
        Buffer.BlockCopy(dis, 0, byData, i * readCount, readCount);
    }
    fs.Write(byData, 0, byData.Length);
}

讀數據

using (FileStream fs = new FileStream("File.FileStream", FileMode.Open, FileAccess.Read))
{
    for (int i = 0; i < Cycles; i++)
    {
        fs.Seek(i * readCount, SeekOrigin.Begin);
        fs.Read(byData, 0, readCount);
        dis = new double[Length];
        Buffer.BlockCopy(byData, i * readCount, dis, 0, readCount);
    }
}

2、BinaryWriter/BinaryReader

2.1 BinaryWriter(將二進位中的基元類型寫入流並支持用特定的編碼寫入字元串。) 詳細介紹參考msdn

using (BinaryWriter bw = new BinaryWriter(File.Open("File.Binary", FileMode.Create)))
{
    byte[] data = new byte[Cycles * readCount];
    for (int i = 0; i < Cycles; i++)
    {
        for (int j = 0; j < Length; j++)
        {
            dis[j] = i * Length + j;
        }
        Buffer.BlockCopy(dis, 0, data, i * readCount, readCount);
    }
    bw.Write(data);
}

2.2 BinaryReader (用特定的編碼將基元數據類型讀作二進位值。)詳細介紹參考msdn

using (BinaryReader wr = new BinaryReader(File.Open("File.Binary", FileMode.Open)))
{
    for (int i = 0; i < Cycles; i++)
    {
        var readData = wr.ReadBytes(readCount);
        dis = new double[Length];
        Buffer.BlockCopy(readData, 0, dis, 0, readCount);
    }
}

3、StreamWriter/StreamReader

3.1 StreamWriter 詳細介紹參考msdn

 using (StreamWriter sw = new StreamWriter("File.Stream", false, Encoding.GetEncoding("utf-16")))
 {
     StringBuilder sb = new StringBuilder();
     for (int i = 0; i < Cycles; i++)
     {
         for (int j = 0; j < Length; j++)
         {
             dis[j] = i * Length + j;
             sb.AppendFormat("{0},", dis[j]);
         }
         sb.AppendFormat("\n");
     }
     sw.WriteLine(sb);
 }

3.2 StreamReader 詳細介紹參考msdn

 using (StreamReader sd = new StreamReader("File.Stream", Encoding.GetEncoding("utf-16")))
 {
     for (int i = 0; i < Cycles; i++)
     {
         string[] ch = sd.ReadLine().Split(new Char[] { ',' },
                                           System.StringSplitOptions.RemoveEmptyEntries);
         for (int j = 0; j < Length; j++)
         {
             double.TryParse(ch[j], out dis[j]);
         }
     }
 }

4 完整測試代碼：

class Program
{
    static void Main()
    {
        fileReadAndWrite.BinaryWriterMethod();
        fileReadAndWrite.BinaryReaderMethod();
       
        fileReadAndWrite.FileStreamWriterMethod();
        fileReadAndWrite.FileStreamReadMethod();

        fileReadAndWrite.StreamWriterMethod();        
        fileReadAndWrite.StreamReaderMethod();        
        
        Console.ReadKey(true);
    }
}

class FileReadAndWrite
{
    private const int Length = 1024;
    private const int Cycles = 64;
    private int readCount;
    private byte[] byData;
    private double[] dis;
    
    public FileReadAndWrite()
    {
        readCount = Length * sizeof(double);
        dis = new double[Length];
        byData = new byte[Cycles * Length * sizeof(double)];
    }
    
    #region BinaryWriter\BinaryReader        
    public void BinaryWriterMethod()
    {
        using (BinaryWriter bw = new BinaryWriter(File.Open("File.Binary", FileMode.Create)))
        {
            byte[] data = new byte[Cycles * readCount];
            for (int i = 0; i < Cycles; i++)
            {
                for (int j = 0; j < Length; j++)
                {
                    dis[j] = i * Length + j;
                }
                Buffer.BlockCopy(dis, 0, data, i * readCount, readCount);
            }
            bw.Write(data);
        }
    }
    
    public void BinaryReaderMethod()
    {
        using (BinaryReader wr = new BinaryReader(File.Open("File.Binary", FileMode.Open)))
        {
            for (int i = 0; i < Cycles; i++)
            {
                var readData = wr.ReadBytes(readCount);
                Buffer.BlockCopy(readData, 0, dis, 0, readCount);
            }
        }
    }    
    #endregion
        
    #region FileStream Read\Write
    public void FileStreamWriterMethod()
    {
        using (FileStream fs = new FileStream("File.FileStream", FileMode.Create,FileAccess.Write))
        {
            for (int i = 0; i < Cycles; i++)
            {
                for (int j = 0; j < Length; j++)
                {
                    dis[j] = i * Length + j;
                }
                Buffer.BlockCopy(dis, 0, byData, i * readCount, readCount);
            }
            fs.Write(byData, 0, byData.Length);
        }
    }
    
    public void FileStreamReadMethod()
    {
        using (FileStream fs = new FileStream("File.FileStream", FileMode.Open, FileAccess.Read))
        {
            for (int i = 0; i < Cycles; i++)
            {
                fs.Seek(i * readCount, SeekOrigin.Begin);
                fs.Read(byData, 0, readCount);
                Buffer.BlockCopy(byData, i * readCount, dis, 0, readCount);
            }
        }
    }
    #endregion

    #region StreamWriter\StreamReader
    public void StreamWriterMethod()
    {
        using (StreamWriter sw = new StreamWriter("File.Stream", false, 
                                                  Encoding.GetEncoding("utf-16")))
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < Cycles; i++)
            {
                for (int j = 0; j < Length; j++)
                {
                    dis[j] = i * Length + j;
                    sb.AppendFormat("{0},", dis[j]);
                }
                sb.AppendFormat("\n");
            }
            sw.WriteLine(sb);
        }
    }
    
    public void StreamReaderMethod()
    {
        using (StreamReader sd = new StreamReader("File.Stream", Encoding.GetEncoding("utf-16")))
        {
            for (int i = 0; i < Cycles; i++)
            {
                string[] ch = sd.ReadLine().Split(new Char[] { ',' },
                                                  System.StringSplitOptions.RemoveEmptyEntries);
                for (int j = 0; j < Length; j++)
                {
                    double.TryParse(ch[j], out dis[j]);
                }
            }
        }
    }
    #endregion
}